Improvement in coal-stoves



UNITED STATES PATENT OFFICE.

HOWARD GREENTREE, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN COAL-STOVES.

Specification forming part of Letters Patent No. 155,236, dated September 22, 1874; application filed May 29, 1874.

To all whom it may concern:

Be it known that I, HOWARD GREENTREE, of Baltimore, in the county of Baltimore and in the State of Maryland, have invented certain new and useful Improvements in Goal- Stoves; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing, making a part of this specification, in which- Figure 1 is a plan view, looking down on the fire-pot and imperforate hearth or fuelsupport inside; and Fig. 2 is a vertical central section through the fire-pot and ashpit on line a w of Fig. 1.

Letters of like name and kind refer to like parts in each of the figures.

This invention relates to an improvement in that class of coal-stoves which have provision between the lower end of the fire-pot and the fuel-support for the free escape of ashes, clinker, and other refuse of combustion; and it consists in the fire-pot, which slopes inward from its upper edge down to a point below its horizontal center, and thence flares outwardly, its fingered or notched end having a considerably-larger diameter than the pot at the point or line where the said outward flare begins; and in the combination of said fire-pot with an imperforate hearth or fuel support, all as will be hereinafter more fully and clearly set forth.

In the accompanying drawings, Arepresents the lower or fire section of a stove; B, the ash-pit section, and O the fire-pot. This is placed or suspended in the fire-pot section of the stove in any usual and ordinary manner; but it has this peculiarity of form or constructionit slopes from its upper end inwardly down to a horizontal line at 0, just belowv which the notches or fingers O begin. At this line the pot flares outwardly, and the fingered or notched end has a considerablylarger diameter than the fire-pot at c. This description represents the said fire-pot in the usual or ordinary form of construction; but it is evident that there may be inconsequential variations in the angles of these inclinations, or in the precise length of the fingers or notches.

It is now intended to describe and represent a fire-pot converging from its top inwardly below its upper half, and thence outwardly, and having its lower end fingered or notched. The upper edge of the said fire-pot fits close and snug in or upon the walls of the stove, so that there is no space between them for any circulation of air or draft. Under the said lower end of the fire-pot O, and at a point or line below the ends of the fingers O, is fixed a close plate or hearth, D, of considerably-less diameter than the fingered end of the fire-pot, leaving, consequently, a space between its edge and the fingers or notches. In the present instance this plate D is supported upon legs or uprights d, attached to the lower edge of inclined plate a of the fire-pot section; but it is not necessarily always so supported. It may be suspended below said fingered end of the fire-pot, or supported from the main wall of the stove, the aim and intent being to mak e its position under and below the lower end of the said fire-pot firm and secure, and yet not cause it to obstruct the draft, the radiation of light and heat from the burning fuel, nor the descent of ashes, clinker, 850., from the firepot.

Heretofore it has been customary, in this particular class of stoves, to have a vibratory or dump in g grate placed a little below the lower plain or notched end of the fire-pot, which grate is of larger or like diameter with the body of the fire-pot, or sometimes of less diameter; but in the device I have now described I have substituted for a grate the fixed imperforate plate or hearth D, placed a little below the lower ends of the fingers C of the fire-pot. The fuel may rest upon this as a support when the stove is in use, while the ashes and refuse products of combustion will readily fall out through the annular space or opening between the edge of the said plate D and the said fingered or notched end of the fire-pot. This process is assisted or made more certain by the flaring shape of the lower fingered or notched end of the fire-pot.

Under ordinary circumstances the operation of this device is such that no raking or poking is required to clear the fire-pot of ashes, &c., but, all this debris falls down off the edge of plate D, and escapes out through the said annular space, and upon the inclined plate or lining at below, and thence through the central opening into the ash-pit. After the fire has been started, a small amount of this dbris accumulates on the upper surface of this plate D but this very seldom becomes so great as to interfere in any material degree with free and efficient combustion. Under usual and ordinary circumstances, this will be the operation of the process of combustion when the fire is let alone. If any clogging does occur, the ashes, 850., can be easily removed by inserting a poker through one of the openings E in the wall of the stove. These openings are placed in the periphery of the part or section of the stove opposite the lower end of the fire-pot, and are provided with doors having mica windows. Thus, it is only necessary to open any one of these doors to gain easy access to the fire pot for abovenamed purpose.

When the fuel is burning, the rays of light from the interstices of the fire-pot will shine into the room through said mica windows.

By this process and detail of construction of the fire-pot and its bottom, I obtain a stove that is very efficient and perfect in its operation.

The invention is suitable for, and easily applicable to, any and all coal-burning stoves in common use, or to hot-air furnaces, ranges, or cook-stoves.

It will be readily seen that there would be no essential change in the nature and scope of my invention if the close plate D should be placed on a line with, or a little Within and above, the lower serrated or pointed ends of the fire-pot.

I am aware that heretofore, in order to introduce air to support combustion, a pipe with a close top and open sides has been placed centrally in and near the bottom of a certain class of stoves and in such instances, when in use, a small part of the fuel has rested upon the said top of said pipe; but the present device is radically different from anything of that kind or description, and chiefly because the imperforate plate D, in its connection and combination with the other parts, as described, constitutes the sole support for the fuel.

- Having thus fully set forth the nature and merits of my invention, what I claim as new 1s 1. In the fire-pot of a coal-stove, a fixed imperforate plate, D, constituting the only fuelsupport, adapted to, and of less diameter than, the lower end of said fire-pot, and between which parts, entirely around the edge of said plate, there is a free and unobstructed space.

2. The inclined fire-pot 0, having the outwardly-flaring fingered or notched lower end 0 and the horizontal imperforate plate and sole fuel-support D, permanently fixed below said end, combined with each other in the manner and for the purposes set forth.

3. The fire-pot G, with flaring and fingered discharge-end U and imperforate and fixed fuel-support D, as described, combined with each other and with the wall of the fire-pot section A of a coal-stove having apertures at E, as and for the purposes herein specified.

In testimony that I claim the foregoing I have hereunto set my hand this 27th day of May, 1874.

HOWARD GREENTREE.

Witnesses:

JOHN R. YOUNG, THOMAS C. UONNOLLY. 

